Réamhaisnéis limistear na farraige
Forecast valid from: 00:00, Thursday 17 September 2026 until 00:00, Friday 18 September 2026
Small Craft Warning
Southwest to west winds will reach force 6 or higher at times tonight (Wednesday) and tomorrow (Thursday) on all Irish coasts.
Gale Warning
Nil
Atlantic Swell
Heavy swell on Atlantic coasts from Thursday afternoon.
Meteorological Situation at 21:00 UTC
Ireland lies in a fresh to strong southwest to west airflow with a depression of 975hPa, centred south of Iceland. Associated fronts are moving eastwards over the country, clearing tonight.
Small Craft Warning: In effect
Heavy Swell (>4m) : yes
Forecast for Slyne Head to Fair Head to Howth Head and for the North Irish Sea
Wind: Southwest to west force 5 to 7 and gusty. Soon becoming west force 6 or 7 and gusty. Later decreasing force 5 to 7 and gusty.
Weather: Rain, drizzle and mist clearing eastwards imminent becoming cloudy or fair with scattered showers. Isolated showers later.
Visibility: Moderate to poor in precipitation and mist, otherwise good.
Forecast for Howth Head to Roches Point to Slyne Head and for the South Irish Sea
Wind: Southwest to west force 5 or 6. Soon becoming westerly and increasing force 7 at times north of Valentia. Later decreasing force 4 or 5, occasionally force 6.
Weather: Rain, drizzle and mist clearing eastwards imminent becoming cloudy or fair with scattered showers. Isolated showers later.
Visibility: Moderate to poor in precipitation and mist, otherwise good.
Outlook for a further 24 hours until 00:00, Saturday 19 September 2026
Fresh to strong westerly winds, backing southwesterly Thursday night and Friday morning and increasing strong to near gale force, possibly touching gale force at times in the northwest and on the Irish Sea. Winds will decrease fresh to near gale force later. Weather: Cloudy to fair with isolated showers at first. Rain, drizzle and mist spreading from the west Friday, clearing to showers in the north and west towards the end of the period.
Forecast issued at: 00:00, Thursday 17 September 2026
All times are local unless specified
